Despite the depiction of yearly milestones such as holidays or birthdays passing, the characters do not age between episodes either physically or in stated age,and generally appear just as they did when the series began.The Simpsons Season 29 DVD uses a floating timeline in which episodes generally take place in the year the episode is produced even though the characters do not age.Flashbacks/forwards do occasionally depict the characters at other points in their lives,The Simpsons Season 29 with the timeline of these depictions also generally floating relative to the year the episode is produced.In a nod to the non-aging aspect of the show, when asked during the episode "The Simpsons Guy how long Nelson Muntz has been bullying him,Bart replies 24 years.